Unable to access variable name corresponding to register RTX in gcc

Question

Is it possible to access the variable name if we have an RTX which is a reg that corresponds to a variable declared by the user in GCC?

I have found the macro REG_USERVAR_P (RTX) in rtl.h which returns the boolean "1 if RTX is a reg that corresponds to a variable declared by the user." But I am unable to get a suitable macro to get the variable name the reg corresponds to.

On dumping the rtl output using the command

print_rtl_single(stdout, in_rtx);

I get output:

(reg/v:SI 68 [ c ])

where c was the variable name defined by me. How do I access c given the rtx statement, in_rtx?

Answer 1

To access the c in your example usethe command:

if (REG_EXPR(in_rtx))
  print_mem_expr (stdout, REG_EXPR (in_rtx));